crypto/tlscredsanon.c

   1 /*
   2  * QEMU crypto TLS anonymous credential support
   3  *
   4  * Copyright (c) 2015 Red Hat, Inc.
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  *
  19  */
  20
  21 #include "qemu/osdep.h"
  22 #include "crypto/tlscredsanon.h"
  23 #include "tlscredspriv.h"
  24 #include "qapi/error.h"
  25 #include "qemu/module.h"
  26 #include "qom/object_interfaces.h"
  27 #include "trace.h"
  28
  29
  30 #ifdef CONFIG_GNUTLS
  31
  32 #include <gnutls/gnutls.h>
  33
  34
  35 static int
  36 qcrypto_tls_creds_anon_load(QCryptoTLSCredsAnon *creds,
  37                             Error **errp)
  38 {
  39     g_autofree char *dhparams = NULL;
  40     int ret;
  41
  42     trace_qcrypto_tls_creds_anon_load(creds,
  43             creds->parent_obj.dir ? creds->parent_obj.dir : "<nodir>");
  44
  45     if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
  46         if (qcrypto_tls_creds_get_path(&creds->parent_obj,
  47                                        QCRYPTO_TLS_CREDS_DH_PARAMS,
  48                                        false, &dhparams, errp) < 0) {
  49             return -1;
  50         }
  51
  52         ret = gnutls_anon_allocate_server_credentials(&creds->data.server);
  53         if (ret < 0) {
  54             error_setg(errp, "Cannot allocate credentials: %s",
  55                        gnutls_strerror(ret));
  56             return -1;
  57         }
  58
  59         if (qcrypto_tls_creds_get_dh_params_file(&creds->parent_obj, dhparams,
  60                                                  &creds->parent_obj.dh_params,
  61                                                  errp) < 0) {
  62             return -1;
  63         }
  64
  65         gnutls_anon_set_server_dh_params(creds->data.server,
  66                                          creds->parent_obj.dh_params);
  67     } else {
  68         ret = gnutls_anon_allocate_client_credentials(&creds->data.client);
  69         if (ret < 0) {
  70             error_setg(errp, "Cannot allocate credentials: %s",
  71                        gnutls_strerror(ret));
  72             return -1;
  73         }
  74     }
  75
  76     return 0;
  77 }
  78
  79
  80 static void
  81 qcrypto_tls_creds_anon_unload(QCryptoTLSCredsAnon *creds)
  82 {
  83     if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT) {
  84         if (creds->data.client) {
  85             gnutls_anon_free_client_credentials(creds->data.client);
  86             creds->data.client = NULL;
  87         }
  88     } else {
  89         if (creds->data.server) {
  90             gnutls_anon_free_server_credentials(creds->data.server);
  91             creds->data.server = NULL;
  92         }
  93     }
  94     if (creds->parent_obj.dh_params) {
  95         gnutls_dh_params_deinit(creds->parent_obj.dh_params);
  96         creds->parent_obj.dh_params = NULL;
  97     }
  98 }
  99
 100 #else /* ! CONFIG_GNUTLS */
 101
 102
 103 static void
 104 qcrypto_tls_creds_anon_load(QCryptoTLSCredsAnon *creds G_GNUC_UNUSED,
 105                             Error **errp)
 106 {
 107     error_setg(errp, "TLS credentials support requires GNUTLS");
 108 }
 109
 110
 111 static void
 112 qcrypto_tls_creds_anon_unload(QCryptoTLSCredsAnon *creds G_GNUC_UNUSED)
 113 {
 114     /* nada */
 115 }
 116
 117
 118 #endif /* ! CONFIG_GNUTLS */
 119
 120
 121 static void
 122 qcrypto_tls_creds_anon_prop_set_loaded(Object *obj,
 123                                        bool value,
 124                                        Error **errp)
 125 {
 126     QCryptoTLSCredsAnon *creds = QCRYPTO_TLS_CREDS_ANON(obj);
 127
 128     qcrypto_tls_creds_anon_unload(creds);
 129     if (value) {
 130         qcrypto_tls_creds_anon_load(creds, errp);
 131     }
 132 }
 133
 134
 135 #ifdef CONFIG_GNUTLS
 136
 137
 138 static bool
 139 qcrypto_tls_creds_anon_prop_get_loaded(Object *obj,
 140                                        Error **errp G_GNUC_UNUSED)
 141 {
 142     QCryptoTLSCredsAnon *creds = QCRYPTO_TLS_CREDS_ANON(obj);
 143
 144     if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
 145         return creds->data.server != NULL;
 146     } else {
 147         return creds->data.client != NULL;
 148     }
 149 }
 150
 151
 152 #else /* ! CONFIG_GNUTLS */
 153
 154
 155 static bool
 156 qcrypto_tls_creds_anon_prop_get_loaded(Object *obj G_GNUC_UNUSED,
 157                                        Error **errp G_GNUC_UNUSED)
 158 {
 159     return false;
 160 }
 161
 162
 163 #endif /* ! CONFIG_GNUTLS */
 164
 165
 166 static void
 167 qcrypto_tls_creds_anon_complete(UserCreatable *uc, Error **errp)
 168 {
 169     object_property_set_bool(OBJECT(uc), "loaded", true, errp);
 170 }
 171
 172
 173 static void
 174 qcrypto_tls_creds_anon_finalize(Object *obj)
 175 {
 176     QCryptoTLSCredsAnon *creds = QCRYPTO_TLS_CREDS_ANON(obj);
 177
 178     qcrypto_tls_creds_anon_unload(creds);
 179 }
 180
 181
 182 static void
 183 qcrypto_tls_creds_anon_class_init(ObjectClass *oc, void *data)
 184 {
 185     UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
 186
 187     ucc->complete = qcrypto_tls_creds_anon_complete;
 188
 189     object_class_property_add_bool(oc, "loaded",
 190                                    qcrypto_tls_creds_anon_prop_get_loaded,
 191                                    qcrypto_tls_creds_anon_prop_set_loaded);
 192 }
 193
 194
 195 static const TypeInfo qcrypto_tls_creds_anon_info = {
 196     .parent = TYPE_QCRYPTO_TLS_CREDS,
 197     .name = TYPE_QCRYPTO_TLS_CREDS_ANON,
 198     .instance_size = sizeof(QCryptoTLSCredsAnon),
 199     .instance_finalize = qcrypto_tls_creds_anon_finalize,
 200     .class_size = sizeof(QCryptoTLSCredsAnonClass),
 201     .class_init = qcrypto_tls_creds_anon_class_init,
 202     .interfaces = (InterfaceInfo[]) {
 203         { TYPE_USER_CREATABLE },
 204         { }
 205     }
 206 };
 207
 208
 209 static void
 210 qcrypto_tls_creds_anon_register_types(void)
 211 {
 212     type_register_static(&qcrypto_tls_creds_anon_info);
 213 }
 214
 215
 216 type_init(qcrypto_tls_creds_anon_register_types);